Centering-punch



0. HLADILEK.-

GENTERING PUNCH.

APPLICATION FILED JUNE 1. 1920.

1 $60,296. Patented Nov. 30, 1920.

PATENT OFFICE.

OTTO HLADILEK, OF CHICAGO, ILLINOIS.

CENTERINGPUNCH.

Application filed June 7, 1920. Serial No. 386,931.

To all whom it may concern:

lie it known that I, OTTO HLADILEK, a citizen of the United States,residing in the city of Chicago, in the county of (look and State ofIllinois, have invented new and useful Improvements inCentering-Punches, of which the following is a specification.

My invention relates to certain new and useful improvements incentering-punches and has for its object to produce a centering devicewhich shall be simple in construction and accurate and reliable in use.

li ith these and other objects in view, an embodiment of the inventionis illustrated in the accompanying drawing and is de cribed in thefollowing specification.

In the drawingsv Figure l is a side elevation of my improvedcentering-punch;

Fig. 2, an end elevation thereof.

Referring to the drawings, I provide a V- blocl: 10 which is preferablymade from a solid piece of square section steel and into the sides ofthis block are cut longitudinal V- recesses 10. These recesses, 10 areobviously at right angles to each other and may be of any desirableangle or depth.

Upon the V-block 10, I mount a slidable guide member 12 which isarranged to retain the punch 11 and to guide it longitudinally along thecenter line A. The guide member 12 is particularly formed with a narrowtop 12 and with the side walls 12 and end walls 12 angularly disposed toprovide surfaces which would be engaged only with. a glancing blow bythe hammer in the event the punch was missed. The feature will not onlyincrease the life of such devices but will keep same in better conditionSpecification of Letters Patent.

Patented Nov. 30, 1920.

for accurate operation due to the decreased intensity of lessdeformation in the guide member 12.

The guide member 12 has the bottom formed with integral guide shoes 12which extend on both sides and below the top out the V-block 10 toconstantly engage it and to thus guide the member 12 with the punch 11.directly on the center line A.

A round shaft 13 for example (shown dotted) may be placed in theV-blockand held rigidly to it by means of any suitable clamp, as for examplethe one shown dotted and indicated by numeral 14. In this manner theshaft 13 will be held in alinement for the punch indentations which maybe spaced as desired by the longitudinal sliding of the member 12.

I claim: I

1. In a centering device, a V-block, a guide-member slidablelongitudinally on said block, and a punch in said guide-memher, saidmember having extensions to guide said member longitudinally on saidV-block.

2. In a centering device, a V-block, a guide-member slidablelongitudinally on said block, and a punch movable in said guideanembcr,the top of said guide-memher having a limited surface to term angu larlydisposed surfaces for the side and end walls.

3. In a centering guide-member said block,

device, a ll-block, a shdable longitudlnally on and a punch movable insaid guidemember, the sides of said guide-member flaring outwardly fromthe top thereof.

In witness whereof, I have hereunto subscribed my name this 2nd day ofJune, 1920.

OTTO HLADILEK.

the missed blow which causes

